Image to Base64 Converter
Convert any image to a Base64 data URL for embedding in HTML, CSS or JSON. Processed entirely in your browser.
Drop image here or click to browse
JPEG, PNG, GIF, WebP, SVG supported
Image to Base64: Embed Images Without External Files
Base64 image encoding converts an image file into a text string that can be embedded directly in HTML, CSS or JSON — eliminating the need for a separate image file or HTTP request. This is widely used in email templates (email clients block external images but allow embedded base64), offline HTML documents, CSS for tiny icons and favicons, API payloads that need to include images, and mobile app development.
Frequently Asked Questions
How to embed an image in HTML using Base64? ▼
Convert your image to Base64 using our tool, copy the full data URL, then use it as the src attribute: 
. This embeds the image data directly in the HTML — no separate image file or HTTP request needed.
. This embeds the image data directly in the HTML — no separate image file or HTTP request needed.When should I use Base64 images vs regular image URLs? ▼
Use Base64 for: small icons/logos (under 5KB) in email templates, inline SVG alternatives, offline HTML apps, API payloads needing images. Avoid Base64 for: large images (increases HTML size by ~33%), images used multiple times (no browser caching), performance-sensitive websites (delays initial HTML parse). For websites, regular image URLs with CDN are always better for performance.
How to use Base64 image in CSS background? ▼
background-image: url("data:image/png;base64,iVBORw0KGgo..."); — This embeds the image in your CSS file. Useful for single-page email templates and small decorative elements. For website backgrounds, use a regular URL for better performance and cacheability.
Does Base64 encoding increase image file size? ▼
Yes — Base64 encoding increases image size by approximately 33% because it represents 3 bytes as 4 ASCII characters. A 100KB PNG becomes ~133KB as Base64. This is acceptable for small images and email use cases but not for large website images where every KB of load time counts.
How to decode a Base64 image string back to a file? ▼
In browser JavaScript: const blob = await fetch(dataURL).then(r => r.blob()); — creates a Blob you can save. In Python: import base64; data = base64.b64decode(base64_string); open("output.png","wb").write(data). Our Base64 Encoder/Decoder tool also handles general Base64 encode/decode.